Abstract
Medium spiny projection neurons (MSNs) are the main neuronal population in the neostriatum. MSNs are inhibitory and GABAergic. MSNs connect with other MSNs via local axon collaterals that produce lateral inhibition, which is thought to select cell assemblies for motor action. MSNs also receive inhibitory inputs from GABAergic local interneurons. This work shows, through the use of the paired pulse protocol, that somatostatin (SST) acts presynaptically to regulate GABA release from the terminals interconnecting MSNs. This SST action is reversible and not mediated through the release of dopamine. It is blocked by the SST receptor (SSTR) antagonist ciclosomatostatin (cicloSST). In contrast, SST does not regulate inhibition coming from interneurons. Because, SST is released by a class of local interneuron, it is concluded that this neuron helps to regulate the selection of motor acts.
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Acknowledgment
We thank D. Tapia and J. A. Laville for technical assistance. L. Carrillo made the acquisition program. This work was supported by CONACyT grants: 42636 to EG and 49484 to JB, DGAPA-UNAM (IN201507, IN201607) and IMPULSA03 grant.
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Special issue article in honor of Dr. Ricardo Tapia.
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Lopez-Huerta, V.G., Tecuapetla, F., Guzman, J.N. et al. Presynaptic Modulation by Somatostatin in the Neostriatum. Neurochem Res 33, 1452–1458 (2008). https://doi.org/10.1007/s11064-007-9579-3
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DOI: https://doi.org/10.1007/s11064-007-9579-3